In Cableguy's input panel if you add
Code:
Sub txt1_LostFocus
txt1.focus
End Sub
Then it will act like a modal dialogue box and not allow the user to do anything else until it is closed
EDIT: Probably obvious but for completeness I should have mentioned for Erels' example
Code:
Sub txtName_LostFocus
txtName.focus
End Sub
also makes a modal dialog box.
EDIT EDIT: Only works on the desktop - not the device!